Scholarlink

<p>Coastal aquifers are critical for irrigation and domestic use but remain highly vulnerable to saltwater intrusion, which degrades water quality and disrupts agricultural activities. This study evaluates the spatio-temporal dynamics of saltwater intrusion in the coastal stretches of the Chalakkudy river basin and neighbouring wetlands, with implications for sustainable aquaculture in line with the United Nations Sustainable Development Goals (SDGs). Here, we employed field-based salinity measurements, elevation models and satellite based Modified Normalised Difference Water Index (MNDWI) analysis to map the intrusion patterns. Our analysis show that salt-affected riverine and wetland zones occupy low-lying regions between –14.5 to 10 m and –144 to –88.5 m, respectively; and riverine salinity peaked in March due to reduced baseflow before the pre-monsoon period, while brackish water zones showed maximum salinity in April, driven by prolonged dry conditions and tidal penetration, consistent with estuarine behaviour in tropical rivers. Contrastingly, wetlands exhibited higher salinity during the monsoon season, with the dilution observed in river stretches. Pond aquaculture accounted for approximately 12% of the saltwater-intruded area, particularly during pre- and post-monsoon periods. MNDWI-based analysis highlighted the influence of rainfall on surface water variability. These findings underscore the need for sustainable water-resource management and demonstrate the utility of GIS-based zonation for identifying intrusion hotspots and supporting resilient aquaculture practices.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Integrated aquatic resource management using GIS: a case study on saltwater intrusion and aquaculture site delineation in Chalakkudy river basin and adjacent Wetlands, South West India

  • 期刊论文

  • 发表日期：

    2025年12月16日

查看全文
  • John Anu,
  • P. Minu,
  • S. R. Regi,
  • N. L. Edwin,
  • M. P. Prabhakaran

摘要

Coastal aquifers are critical for irrigation and domestic use but remain highly vulnerable to saltwater intrusion, which degrades water quality and disrupts agricultural activities. This study evaluates the spatio-temporal dynamics of saltwater intrusion in the coastal stretches of the Chalakkudy river basin and neighbouring wetlands, with implications for sustainable aquaculture in line with the United Nations Sustainable Development Goals (SDGs). Here, we employed field-based salinity measurements, elevation models and satellite based Modified Normalised Difference Water Index (MNDWI) analysis to map the intrusion patterns. Our analysis show that salt-affected riverine and wetland zones occupy low-lying regions between –14.5 to 10 m and –144 to –88.5 m, respectively; and riverine salinity peaked in March due to reduced baseflow before the pre-monsoon period, while brackish water zones showed maximum salinity in April, driven by prolonged dry conditions and tidal penetration, consistent with estuarine behaviour in tropical rivers. Contrastingly, wetlands exhibited higher salinity during the monsoon season, with the dilution observed in river stretches. Pond aquaculture accounted for approximately 12% of the saltwater-intruded area, particularly during pre- and post-monsoon periods. MNDWI-based analysis highlighted the influence of rainfall on surface water variability. These findings underscore the need for sustainable water-resource management and demonstrate the utility of GIS-based zonation for identifying intrusion hotspots and supporting resilient aquaculture practices.